66677719 has 2 divisors, whose sum is σ = 66677720. Its totient is φ = 66677718.

The previous prime is 66677693. The next prime is 66677731. The reversal of 66677719 is 91777666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66677719 - 2⁵ = 66677687 is a prime.

It is a super-2 number, since 2×66677719² = 8891836422085922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66677789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33338859 + 33338860.

It is an arithmetic number, because the mean of its divisors is an integer number (33338860).

Almost surely, 2^66677719 is an apocalyptic number.

66677719 is a deficient number, since it is larger than the sum of its proper divisors (1).

66677719 is an equidigital number, since it uses as much as digits as its factorization.

66677719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 666792, while the sum is 49.

The square root of 66677719 is about 8165.6425956565. The cubic root of 66677719 is about 405.5025393080.

The spelling of 66677719 in words is "sixty-six million, six hundred seventy-seven thousand, seven hundred nineteen".